Difference between admin and user account permission

Admin and users also known as sender are usually the staff in an organization who can login to RapidSMS web portal to send message.

Contacts also known as recipients are different from users and admin. They do not have the ability to login to RapidSMS web portal nor have the ability to send message except to reply Sender. RapidSMS App users are classified as contacts in RapidSMS.